Baorder 4Pcs Trapano foro Quadrato Mortasatrice Scalpello Set, Lavorazione del Legno Punte per Trapani (6,4 mm / 8 9,5 12,7 mm)

【Premium Material】------ The square hole drill bit set made of bearing steel, hardness 56HRC, high hardness, durable and practical, heat treatment, long service life 【Cost-Effective】---Including sleeve and drill core . Woodworking drill bit sets with long drill core and square chisel, easy to lock the hole on the wood, can get different mortisers quickly. Also, it can help reduce labor intensity of construction workers, speed up the construction speed 【Using Range】 -- These woodworking morstising chisel bits set are suitable for drilling square holes in wood with a mortising machine or a mortising attachment. which can greatly improve the working efficiency of carpenter, also suitable for installation, decoration and other industries 【Fit Machine】--- These square hole bits only use for the opening square hole and keyhole drill. On the other hand, the square hole drill can not be used on an electric drill, bench drill. Drill square holes need to fit a square hole drill drilling (mortise and tenon machine) to use 【What You Get】--- Come with 4 different size square hole drill bits. Square hole, 1/4"(6.4mm), 5/16"(8mm) , 3/8"(9.5mm) ,1/2"(12.7 mm)