Five piece set includes bits for drilling pilot holes for screw sizes #5, #6,#8,#10 and #12 Special designed steel counter sleeve countersinks or counter bores pilot hole Adjustable counter sleeve depth with Allen key wrench Standard hex shank is quick change compatible Drill and countersink for wood screws without changing bits Drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew Colour:silver Material:High speed steel + carbon steel Package Contents: 2 sets * 5pcs [5/6/8/10/12] drill bits and matching hexagon wrenches 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.