Features: Engineered with a twist and lock quickly changes system, this 4inch aluminum snails lock backer pad secure mounts gemstones polishing pad via M14/5/8-11 thread, minimizing downtimes during 5000RPM operations. Features a central water hole for wet stone polishing and solid aluminum rubber construction rate for 5000RPM, ensuring compatibility with gemstones edges polishing pad holders. Ideal for professional stone fabricators, contractors, and renovations groups requiring reliable tool accessories for heavy duty edges profiling and surfaces finishing. Perfect for polishing marble countertops, granites floor, or engineered stone surfaces where rapid pad changes and vibration dampening rubber backings is critical. Combines brass threaded durability with ergonomic efficiency, solve common slippage issue in stone processing while maintaining alignment during prolonged grinding tasks. Specifications: Materials: Alloy, rubber Diameter: (10cm/3.93inches)/(12.3cm/4.84inches)(Optional) Type:4In M14/4In 5/8-11 Hole(Optional) Package Includes: 1Pc Snails Buckles Rubber Joint note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the differences between different monitors, the picture may not reflect the actual color the item.