Trend CLT/SLV/638 Collet sleeve 6.35mm to 8mm. Reduction sleeve used to reduce the collet size to take cutters with smaller shanks. Should only be used as a stop-gap, as the correct size collet is recommended. Should not be used for extensive periods or heavy work. Diameter: 8 mm, Overall Length: 25 mm, Bore: 1/4 inch, Bore: 6.35 mm.