[Aluminum Limiter Ring]The countersink drill bit features -colored aluminum limiter ring to prevent scratches. Beneath the limiter ring is a green anti-scratch rubber pad. The green rubber pad not damage the workpiece. These descriptions emphasize the product's durability and the protection of the material ! [Adjustable Depth Countersink Set]The four drill bits can be inserted into the bit holder as The drill bits have a fixed countersink that can be adjusted in depth. The bit holder also has a depth stop that can be precisely set. [4-Piece Countersink Set]Wood drill bits with countersinks. The countersink set includes four different sizes: 2.8 x 8 mm, 3.2 x 8 mm, 3.5 x 10 mm, and 4 x 10 mm (this is a third-generation model, an improvement over older designs). [Fast drilling]Drill with countersink The build quality of the tool is solid, with smooth rotation and precise depth adjustment.The engraved markings easy to set the correct depth,allowing you to position the countersunk screws flush with the or slightly if desired.Setting the depth requires no tools; simply rotate the body. [Wide Range of Applications]Pre-drill with countersink, countersink drill bit set for wood. Suitable for natural wood, chipboard, fiberboard, plywood, and MDF. It is a very complete set of tools that allows you to create countersinks very precisely and easily., Manufacturer: Akfldms