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Specification: T8 Anti Bachlash Nut: Suitable for 3D printer T8 lead screw Lead screw diameter: 8mm Pitch: 2mm Size: 45 x 22 x 13.5mm/1.77 x 0.86 x 0.53inch 1 Set includes 2 parts + 1 spring. Special anti backlash nut, high precision, low cost DIY engraving machine, 3D printer preferred. Couplings 5mm to 8mm: Size: 5mm to 8mm Material: Aluminum alloy Dimensions: 19mm x 25mm/0.75 x 0.98inch(D x H) Quantity: 2pcs With 4 set screws on each coupling, easy to install. Compatible with NEMA 17 stepper motors (for 5mm shaft diameter). Great accessories for RepRap 3D Printers and small CNC machines. Package Content: 2 x T8 Anti Bachlash Nut 2 x Shaft Coupler 5mm to 8mm