Center Drill Bit Set superior drilling performance which is guide for centering holes needed for the hinges. can perfectly replace worn or damaged drill bits and bit holder. Double-sided hole design fast and automatic discharge sawdust from the hole on both sides, without drill blocked, which helps you save time in removing sawdust.After repeated testing, it has better performance than the old version. Countersink Drill Bit Set and Bit holder has been upgraded,High quality Ultra hard steel self centering drill bit design More impact , prevents wood grain from changing the stroke of the drill bit and damaging the wood, facilitating precise drilling. CC2430 self centering drill bit set fits for 1/4 In -Change hex shank drill for Hinge and Wood. Standard hex shank allows various chuck sizes, for #6 #8 #10 Screws Size. Including 3/32 inch, 7/64 inch, 1/8 inch drill set. Note: Pease check your accessory model, drill model to the compatibility. The drill guide Easy to Install plug and play , provides fast, one handed loading and releasing of drill bits, So you can change drill bits quickly without re clamping, reducing downtime and improving productivity., Manufacturer: Akfldms