Professional countersink HSS drill bit set for commercial or occasional use Titanium coated drill bit set Set of 4 countersinks with pilot drill bits and depth adjustment Allows for accurate drilling and countersinking of countersunk screws and fixings Simple to use Simply loosen the collar, adjust the drilling depth and then retighten the collar Titanium coated drills for maximum strength and durability As well as for maximum strength it reduces friction as well Sharp cutting flute leaves a clean smooth finish 2.38mm – 3.55mm pilot drills All come with a 1/4" hex shank so can be used in all drills whether electric, battery or air but as well as this in quick release change drills for ease and convenience of use Hardened and tempered steel suitable for use with hand or power drills SPECIFICATIONS • 4pc countersink drill bit • HSS – G drills • Complete with 1/4" hex shank • Adjustable depth • HRC 40 – 42 SPECIFIC SIZES • #6 – Pilot drill 2.38mm – overall length 55mm • #8 – Pilot drill 2.78mm – overall length 60mm • #10 – Pilot drill 3.175mm – overall length 63mm • #12 – Pilot drill 3.56mm – overall length 65mm