Dual Groove
Cast Iron 6" Pulley Dual Groove B Section V Belt 5L with 7/8" Sheave Bushing
You can use Super Lube Multi-Purpose Synthetic Grease on 3D printer rails for smooth motion.
Cast Iron 6" Dual Groove Belt B Section 5L Pulley with 1-3/8" Sheave Bushing
Red Rubber Grease is a solid choice for lubricating fifth wheels on trailers.