1000PCS DIY Pulley Plastic Gears toy wheels concave dia.36mm TH=4mm Aperture:2.9mm yellow NEW *FD263X1000 Product Description DIY Pulley Plastic Gears toy wheels concave dia.36mm TH=4mm Aperture:2.9mm yellow NEW *FD263X10 Features Material: plastic one hundred pc Brand New Diameter: 36mm Thickness: 4mm Aperture: 2.9mm(Tight fit for 3mm,with a flat hole) Surrounding aperture: 1.9MMX4 2.05MMX4 distance between holes: 0.5MM Package 1000PCS X Plastic Pulley (Yellow)