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Square Hole Mortise Chisel Drill Bit Tools, Woodworking Hole Saw Mortising Chisel Drill Bit Set Twist Drill, Different Sizes 1/4" 5/16" 3/8" 1/2" (4pcs) - Ziosxin, GB-9652
Ziosxin GB-9652
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This square hole drill bit is great for drilling square holes in wood with a mortising machine or a mortising attachment. This mortising chisel fits all mortising machines and drill press attachments 6.4mm (1/4"), 8mm (5/16"), 9.5mm (3/8"), 12.7mm(1/2") sizes The drill bits for square holes with high performance flute design geometry for superior chip extraction Made of the highest quality tool steel Hardness: HRC 48~50 Used with mortising chisel , if extend square hole manually, need to use electric drill, hammer and other tools.
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