Mindrill has been in the precision engineering industry with a world-class production facility comprising CNC and VMC machinery. Tapered button bit CNC grinding, sealed quench heat treatment furnaces, all led by an expert engineering team to ensure customer satisfaction. rock drill tools Since 1971, Mindrill has been manufacturing an industry-leading line of top hammers including pneumatic and hydraulic drifters & tapered button bit are made from premium quality raw materials and are engineered for high penetration rates and long service life. As tapered bits are gaining popularity by the day, Mindrill aims to provide nothing but the best to its customers as always to maximize their profits.