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Router Bit And Endmill Shank Block
A 161 x 40 x 20 mm bench block with 20 shank sockets sorted by size — 6 x 1/4", 6 x 8 mm, 4 x 3/8" and 4 x 1/2" — so router bits and CNC endmills stop rattling against each other in a tin. Each size group is marked by a count of notches on the front face (1 notch = 1/4", 4 = 1/2") because a 1/4" and an 8 mm shank look identical by eye; every socket has a 3 mm chip drain through its floor into the hollow underside, and two counterbored M4 holes let you screw it to the bench or a tool wall.
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