Specifications

Material^$Carbon Steel^#Wobble in Tolerance^$ less than 0.5mm^#Heat Treatment^$Use whole heat treatment, the HRC is 45-55 ^#SIZE^$15mm, 18mm, 20mm, 22mm or

3/8",1/2",3/4",1"^#Surface available^$polished,Tin-coated,black finished and so on^#

Features

cut way^$can move Forwards, Backwards, and Sideways on the wood and can make straight hole and curved.^# Patent^$We have the patent of "MAD" Bit in China: Practicality in China 03203524.1; Outlook design in China 02309029.4 we also have the patent in UK: GB2388803 and the United States Patent and Trademark Office also accept our Patent Application. ^#angle^$Amazing directional control,9 different cutting edges ^#speed^$2 times faster than spade bits^#