Material: aluminum alloy ；Size: 1.1 x 0.87 x 1.38 inches/ 28 x 22 x 35 mm ； Bottom diameter: 19 mm or 20mm ；Package includes: 8 pcs . Our woodworking bench dogs are more durable than their plastic counterparts, making them well-suited to handle complex and challenging work environments. No need to worry about wear and tear. The anodized surface not only adds an enhanced layer of strength but also contributes to the sleek aesthetic, making your workshop look professional and ready for any woodworking task. Fits standard 19/20mm diameter Bench hole. Bench Brakes press in place for solid, non-slip work .