Size - Shaft Hole Diameter 6mm Outer Diameter 18mm Thickness 7.3 mm Groove Width 4mm Material The guide pulley is made of alumina ceramic, which is durable and long-lasting. The smooth surface allows for flexible sliding, low noise, and excellent wear resistance. Features Smooth surface, excellent wear resistance. Application This guide pulley is an excellent tool for building track systems for lockstitch sewing machines, sewing machines, etc. ⚠️Please make sure that the shaft hole diameter matches your device before purchasing. Guide Pulley Wheel 6x18x7.3 mm Aluminum Ceramic Deep Groove Pulley Bearing for Lockstitch Sewing Machines Sewing Machines Pink Set of 2 ☑︎ Immediate purchase available❣️ ☑︎ First come, first served for only one item❣️ ☑︎ Follow discount❣️ 200 yen off for items over 1500 yen♪ ☑︎ Regarding "Like New" The item has been opened once to check its condition, but the contents are brand new✨ #yu-mama products