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Flexible coupler, removes stress between motor and driving component; 5mm to 8mm, great for RepRap 3D Printers and small CNC machines. Coupler Dimensions: 19mm x 25mm/0.75 x 0.98inch(D x H). Not a match kit, please check the size before you purchase. High quality anti-backlash nut, high precision, suitable for 3D printer T8 lead screw. Pitch: 2mm; Lead: 8mm. Package Content: 2 x Shaft Coupler 5mm to 8mm + 2 x Anti Backlash Nut.