Designed specifically for jewelry timing polishing. Also suit for steel, iron, copper materials such as polishing, rough finishing, precision and gloss polishing. The polisher have four different speed settings to provide more care treatment for precious jewelry. Automatic bi-directional rotation time is 0-60 minutes. The rotary tumbler takes the principle of centrifugal motion that can improve work efficiency 5 to 10 times. Practical and necessary polishing tool for jewelry makers. Excellent for studio and small jewelry projects. The Barrel is multi sided that made of plexiglass material, leak proof and will not corrode or rust. It can use for long time., Weight: 2.1164377152 pounds, Manufacturer: YUYTE