The photo carries the measurement, because that is the first thing a buyer needs: 510 x 420 x 70 mm, moulded in white PP with a lattice base and a vented side wall. It is a shallow, open tray rather than a pot saucer. Nothing in it is sealed, so it is used to carry, hold and drain things rather than to keep water in.

It belongs to the same planting tools range as our seeding trays and bench accessories, and it is sized to work alongside them rather than on its own.

Seventy millimetres is a deliberate figure. A tray any shallower will not take a full pot standing upright; a deeper one wastes headroom on a shelf and blocks light to the row below. At 70 mm the tray holds standard pots and small grow bags without tipping, and it still stacks with a clearance that lets a stack of empty trays dry after washing instead of trapping water between the bases.

The 510 x 420 mm footprint is the other half of the choice. It is small enough to be carried by one person when loaded and large enough to hold a working batch of pots, so it moves between the bench and the sales area without being repacked.

On a greenhouse bench it catches run-off under a block of pots, and the lattice base lets the water through so the pots are not standing in it. On capillary matting it acts as the carrier that lifts a batch of small pots on and off the bench as one unit. In a sales or dispatch area it groups plants for a customer and can be lifted straight to the van. In storage it holds stakes, labels and ties, and the vented sides let it be hosed out and left to dry.

What all four have in common is that the tray is used wet. That is why the base is a lattice and the sides are vented: a solid tray would simply become a pond, and a pond under a bench is where algae and fungus gnats start.

Because the tray is a standard size rather than a bespoke moulding, a bench can be laid out in whole trays once the working width is known. Send us the bench length and width and the pot size you run, and we will quote the tray count that fills the bench with the least waste at the edges. Guidance on bench layout and irrigation is published by FAO, and commercial practice is reported monthly by Greenhouse Grower.

1. Material : PP material.
2. Color : White.
3. Size : 510 x 420 x 70 mm.
4. Usage Time : Can be used for 3 years under normal usage.
5. Scientific design : First quality material make it good for permeability and ventilation.

We are the manufacturer specialize in greenhouse and planting tools with above 35 years. We supply over 1,200 different kinds of planting tools. Our planting tools are widely use by farm and agricultural sciences academy and institute at home and abroad. We exported our products more than 120 different countries all over the world.

Q: Is this a saucer or a tray?
A: It is a tray. At 70 mm deep and with a vented side wall it is made to carry and drain pots, not to sit under a single pot as a water saucer.

Q: What is the exact size?
A: 510 x 420 x 70 mm, moulded in white PP. The footprint suits a bench laid out in whole trays, and the depth clears standard pots standing upright.

Q: Will water stand in it?
A: No. The base is an open lattice and the sides are vented, so run-off passes through instead of collecting. That is what keeps the tray usable under a block of pots.

Q: Can loaded trays be stacked?
A: Empty trays stack and dry without water trapping between the bases. Loaded trays are best kept single-layer, because stacking them would block the light to the plants below.

Q: Can you work out how many I need for a bench?
A: Yes. Send the bench length and width and the pot size you use, and we will quote the number of trays that fills the bench with the least waste at the edges.