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With the 4.5 mm -7 mm collet set for the MOTOM BSM 25 drill grinding machine, you can extend the grinding range down to 4.5 mm. This extension set contains 7 special Motom collets ER 16 D = 4.5 mm – 7 mm, in increments of 0.5 mm incl. collet holder and wrench. The small collet holder serves as an adapter and is inserted into the standard collet holder using a collet.