ToolUSA 5pc Grinding/polishing Stone Set - Premounted On 1/8" Shank: TJ04-04112-Z02 : ( Pack of 2 Sets ) Includes 3 Packs Of 5 Piece Set Pre-Mounted Overall Length: 1.75" , 1/8" Shanks Variety Of Shapes : Round, Bullet, Inverted Cone, Cylinder : Small and Big Material : Aluminium Oxide (Excellent abrasive for metals with hardness up to steel)