Can be clamped onto any drill* from 3mm to 10mm. An innovation and Universal solution to the problem of drilling holes to an accurate depth. Special design to minimize any marks on the surface being drilled. User friendly – Quick assembly and easy drill-depth adjustment., #20210, overall length (L) 7/8, range of drill 3mm to 7mm (1/8 to 1/4), 20210 adjustable 3mm to 7mm (1/8 to 1/4) Universal drill depth-stop