Most of the workbench holes are not very precise, they usually have a few millimeters difference. If the size is not suitable for your hole, you can change another size.Made of high-quality Aluminum Alloy material with black surface processed, wear-resistant & durable.Heavy duty,will not break Bench dogs are an essential hold down device that should be a part of any workbench;Great for routing, cutting, and sanding.Fit for woodworking baffles which has a 20mm bench dogs hole, for 20mm holes on an worktop.Square clamping pad for secure hold.Specification:20mm bench dog size: 28 x 35 x 20mmFits for hole size:20MMEach weight: 31g Material: Aluminum alloycolour: redPackage Contents:1 set x Bench DogOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.