5 PCS Countersink Drill Bit Set, HSS M2 Tapered Bits, 82° Counter Bore, 1/4" Hex Shank, Replaceable 7/64'' x 5/16'', 1/8'' x 5/16'', 9/64'' x 3/8'', 5/32'' x 3/8'' Drill Bits, Carpentry Tools(Gold)

This high-performance alloy drill bit set includes four sizes (2.8×8mm, 3.2×8mm, 3.5×10mm, 4×10mm) with 3/8" and 1/4" hex shanks, featuring an innovative bearing/O-ring design with depth control for clean, clog-free woodworking in various materials at low speeds (200rpm), excluding metal use

• The drill bit set comes in four different sizes: 2.8 x 8mm, 3.2 x 8mm, 3.5 x 10mm, and 4 x 10mm (all with a 3/8" drill bit and a 1/4" hexagonal drill bit), along with a hexagonal wrench
• The deep-punch drill bit is made of an alloy with excellent cutting performance and wear resistance. It features an internal bearing and an O-ring at the front. A stop ring stops rotation when the tip contacts the board while sinking the hole, preventing damage
• The deep-impact wood sinking drill bit does not penetrate, improving work efficiency. Its adjustable drop length, with a cross-reference dimension, allows for adjustment of the drilling length for different screw lengths. The added seamless depth control ring effectively reduces surface damage
• The spiral edge of the wood sinking drill set quickly removes debris from the outside of the hole, effectively preventing the accumulation of dirt residue and clogging
• The deep-punch wood drilling set is suitable for natural wood, tiles, artificial fiberboard, plywood, and MDF. Note: For best results and a smooth edge, run the drill at a low speed of approximately 200 rpm. Not recommended for metal and steel