Specifications: 12mm hex shaft
Size: total length 330 mm, screw length 240 mm
Shaft: plain steel
Blade: ordinary steel
Product introduction Ideal for deep through holes [Uses] 28mm drilling drill for general wood [Features] Compatible with a wide range of drilling from shallow to deep holes Use with electric drills The tip screw type allows for easy continuous drilling [Notes] *Do not use with power tools that rotate at high speeds (1500 revolutions per minute or more). From Amazon ● Can be used for a wide range of holes, from deep holes to shallow holes