8Mm I.D. X 20Mm O.D. Hydraulic Chuck Collet (Reduction Sleeve: Closed Type). Yg1 Part # 920080. Closed Type Hydraulic Chuck Reduction Sleeves (Collets) Are For Use With Coolant-Through Tools. The Use Of Reduction Sleeves Greatly Improves The Usefulness Of A Hydraulic Chuck. Use A Reduction Sleeve To Hold A Different Diameter Tool Shank And Increase Transferable Torque By Approximately 25%.

• The Reduction Sleeve Outside Diameter Must Match Your Hydraulic Chuck's Nominal Inside Diameter.
• Reduction Sleeves Are Available In 6 Different O.D.s; 1/2", 3/4", 1-1/4", 12mm, 20mm & 32mm For Clamping Tool Shanks From 1/8" To 1" & 3mm To 25mm.

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