The jacobs BT 30 ER 32 tool holder has 100-mm projection and is prebalanced to 20,000 RPM at G2.5. The jacobs BT 30 ER 32 tool holder is used for milling, drilling and reaming and is suitable for CNC machines and machining centers with automatic tool changers. This jacobs BT 30 ER 32 tool holder features highly precise, accurate concentricity with T.I.R <= .0004-Inch at 4x D from the nose. The rigidity of the jacobs BT 30 ER 32 tool holder is ensured by high alloy steel properly hardened and heat treated for greater durability and longer life. The jacobs BT 30 ER 32 tool holder is laboratory certified and like all jacobs chucks products, includes a one year factory warranty