Description of Premium Woodworking Square: Exceptional Mortising Countersink Tool for Industrial Power & Hand Tools by a Skilled Woodworker
Material: These square hole drill bits made of high speed steel, through heat processing, with high hardness drill bits, and sharp-edged square chisel, long life using. High working efficiency: Woodworking drill bit sets with long drill core and square chisel, easy to lock the hole on the wood, then you can get different mortisers quickly. Also, it is labor saving. Size: Come with 5 different size for your choose. Square hole, 1/4"(6.4mm), 5/16"(8mm), 7/16"(11mm), 1/2"(12.7mm), 5/8"(16mm). Corresponding shank, 7/40"(4.4mm), 2/9"(5.8mm), 10/31"(8.2mm), 3/8"(9.8mm), 3/8"(9.8mm). More details please check the second picture and it is more intuitive. These long square drill bits set can meet most of your needs, and each drills packed in a single plastic case, easy to maintain. Available application: These woodworking morstising chisel bits set are suitable for drilling square holes in wood with a mortising machine or a mortising attachment. Also, it fit for bench drilling machine. ATTENTION: These square drill bits are not fit for any hand drill. Please make sure that the wood borad and the drill are at a 90 degree angle. (Also we describled installation step in below product description.). Warranty: We guarantee provide you satisfied service, if there is any quality problem, you can just contact us, we can send you a new one or refund you the full payment.