Bosch 38636-01 36-Volt Litheon Drill/Driver with 2 Compact Batteries Unibody Power train - keeps gearing in alignment for the most durable drive train on the market Steel Reinforced Collar - Provides enhanced durability when dropped on the chuck Dura shield Housing - Constructed to withstand real world conditions. Withstands repeated 1-story drops when the competition fails Easily Accessible Brushes - Quick maintenance to minimize downtime