A collet reducer allows for use of smaller shank bits to fit your spindle collet. Available in range of sizes to fit 6.35mm, 6mm, 4mm and 3.175mm. For optimal results, use the appropriate collet for your bit's shank.
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Very impressed with this collet. I haven't measured the runout but it seems very good.
Adam is extremely knowledgeable and helpful. The collet was was of a high quality and was delivered extremely quickly Thank you