5mm Hex Spacers are compatible with the REV DUO System and accurate way to space gears, sprockets, wheels, and other parts along a 5mm hex shaft. Mix and match various spacer lengths to adjust spacing in increments as small as 1.5mm. Specifications Material: Acetal (Delrin/POM) Length: Varies Based on Product Selection (see table below) OD: 8mm ID: 5mm Hex Documentation DUO Build System Guide Product Options SKU PRODUCT NAME CAD & DRAWINGS REV-41-1325-PK28 5mm Hex Shaft Spacer - 1.5mm - 28 Pack STEP FILE ONSHAPE REV-41-1324-PK16 5mm Hex Shaft Spacer - 3mm - 16 Pack STEP FILE ONSHAPE REV-41-1323-PK12 5mm Hex Shaft Spacer - 15mm - 12 Pack STEP FILE ONSHAPE