Large 4-Way Chuck Key. Designed to Use On Chuck Key Sizes: 1, 2, 3 and 4. Chuck Sizes: 1/4" (6mm), 3/8" (9mm), 1/2" (13mm), 5/8" (16mm). Features: Large 4-Way Chuck Key Designed to Use On Chuck Key Sizes: 1, 2, 3 and 4 Chuck Sizes: 1/4" (6mm), 3/8" (9mm), 1/2" (13mm), 5/8" (16mm) Overall Dimensions: 3" x 3" x 5/8" (L x W x D) Total Weight: 2 Ounces.
