The AndyMark Hex Molded Spacer 5mm Hex Bore, 0.188in. Length is designed to ensure components remain securely in place, ideal for custom drivetrains or manipulators. This spacer features a 5mm hex bore, suitable for common shaft types, and can also be used with round shafts and bolts. Constructed from black polycarbonate, it offers durability and resistance to cracking, making it a reliable choice for various applications.