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Specification: Material: Aluminum Precision bore: H8 Bore: 5mm & 8mm Length: 25mm Suitable for: With encoder, engraving machines, 3D printers and other ancillary uses Feature: Aluminum alloy, long service life Have relatively good elasticity, with a stepper motor, encoder, servo motor drive, etc. Packing included: 2 x Flexible Coupler 1 x Allen Key