GT2-36T Pulley (5mm Bore / 36 TOOTH / 6mm BELT)

M3x6/10/15/20 Single/Double-Pass Hex Copper Column Kit with Screw and Nut

625ZZ Double Shielded Deep Groove Ball Bearings 5mm x 16mm x 5mm 

Aftermarket Nema17 Mounting bracket - Plastic

GT2 10mm Timing belt. Steel inner.  They have a special profile with rounded teeth which reduces backlash. Used for precision 3D printers and...

M1/1.2/1.4/1.6 600pcs Copper Nickel Plated Round Glasses Screw Nut Kit

GT2-20T Double head bore Synchronous wheel

ID: 8mm

16 teeth pulley for GT2-10mm Belt with 5mm Bore (typically used on Nema 17 Stepper motors)

20 teeth Pulley for GT2 6mm with 8mm bore ( normally used on 8mm shaft )