Material: Be made of aluminum alloy, surface treatment,laser engraving scale Parts:stainless steel drill sleeve+brass stop block Adjustable Metal Bushings 8/15mm Metal bushings accurate alignment when drilling hole,easy to adjusting drilling height and hole depth Applications:Can be used for woodworking,Quick Positioning for different thickness, easy to producing joints.Colour:black Material:aluminum alloy type:A Package Contents: 1 x 3-in-1 positioning hole punch set Only the above package content, other products are not included.Note: Light reflection 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.