MB v-belt Made from durable 7075-T6 aluminum Comes with 2x HK1015 bearings installed for 10mm shaft 4x M5 screws for mounting blade with included washer 45mm dia, 35.7mm width Designed for 5mm or 1/4" AR blades (can also fit 3/8” blades) 36mm pitch diameter for 6mm V-belt Includes hardened steel washers to put between hub and uprights 60.5 grams just hub 81.3 grams assembly Black Anodized Flat Timing Belt Made from durable 7075-T6 aluminum Comes with 2x HK1015 bearings installed for 10mm shaft 4x M5 screws for mounting blade with included washer 45mm dia, 35.7mm width Designed for 5mm or 1/4" AR blades 34mm pulley diameter Includes hardened steel washers to put between hub and uprights 57.4 grams just hub 78.2 grams assembly Black Anodized Shaft Made from 52100 hardened steel M6 end tapped (comes with flanged M6 screws) 10mm dia x 57.15mm length designed for 3/8" UHMW uprights Comes with custom aluminum anti-wallowing washers Includes M4 self tapping screws to mount the washers Includes hardened steel washers to put between hub and uprights 25.4 grams just shaft 42 grams assembly Find the 3D model HERE