[EASY TO INSTALL]- the diameter of internal and external threads is 10mm, and the length of the grinder extension shaft is 80mm and the actual extension length is 60mm.Notched for easy removal with a wrench, fits Model 100 Grinders/Polishers. [YOU WILL ]- 2 grinder extender and 4 lock nut,so you can the suitable one as you need, or besides, these polisher extensions can be interconnected with each other, so you can a shaft by connecting . [HIGH QUALITY]- grinder extension connecting rods with high hardness iron,more stronger and durable.10mm diameter makes the speed constant and steady,effectively avoid the needless vibration in the polishing work [GREAT for SMALL AREAS]- with extension shaft set, you can polish the corners where the polisher cannot , safe for car and machine never need to be upset the awkward spaces or narrow areas hard to reach anymore [MULTI-FUNCTION]- This adapter turns your grinder from a simple hand tool into a multi-functional extended version grinding machine tool. You can cut drywall, wood, metal, plastic, deburring, polishing, rust removal, and waxing. Colour:silver Material:iron Package Contents: 2 x grinder extender 4 x lock nut Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.