Travers has high-quality Precision Keys made by LFA and Shark Tools. These precisions keys have varying maximum drill chuck capacity and minimum drill chuck capacity. The minimum drill chuck capacities offered are 0 inches to 3/16 inches, and the maximum drill chuck capacities vary from 1/2 inches to 5/8 inches. There are different mount types available like 2JT, 3JT, 4JT, 6JT, and 33JT. There are different types of bearings as well, plain bearing and ball bearing. The precisions keys made by LFA are super key chucks that come with a plain bearing. The mount types available are 2JT, 3JT, 4JT. The minimum drilling capacity ranges from 0 inch to 3/16 inch. The maximum drilling capacities are 1/2 inch to 3/4 inch. Shark Tools produce Super Ball Bearing Heavy Duty Industrial Chucks. The bearing type is ball bearing. The mount type is 3JT, 4JT, 6JT, 33JT. The minimum drill chuck capacity varies from 1/32 inch to 1/8 inch and the maximum drill chuck capacity is 1/2 inch to 3/4 inch.