8 x 3-12mm Countersink Drill Bit Set Adjustable Depth Stop Collar
8 Piece Drill Depth Collar
Diameters that are included: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 16mm
Allen key included
Used for attaching to drill bit to set the depth of the hole you require with ease