ER-40 Hex Collet Block(approx. 50*75mm); ER-40 Square Collet Block(approx. 45*80mm).. Flatness, parallelism and sureness within 0.0005".. Use special alloy stell material, possess superior durability.. Simple installation, suitable for high frequency use.. For parallel, square or hex shapes as well as for cross-hole drilling at 60, 90 or 120..
