1/8 X 4 10 Pair Precision Parallel Set Made from fine quality tool steel stress relieved against distortion. Precision ground and hardened. Complete with fitted durable plastic case. 2 holes in each parallel. Tolerance is parallel to 0. 0003 on 2 sides, top & bottom. Includes the following sizes: 1/8 X 1/2 X 4 , 1/8 X 5/8 X 4 , 1/8 X 3/4 X 4 , 1/8 X 7/8 X 4 , 1/8 X 1 X 4 , 1/8 X 1-1/8 X 4 , 1/8 X 1-1/4 X 4 , 1/8 X 1-3/8 X 4 , 1/8 X 1-1/2 X 4 , 1/8 X 1-5/8 X 4 . Dimensions are within 0. 001 allowance. Ultra-High Precision - Precision ground and hardened with a remarkable 0.0003-inch tolerance for critical setup accuracy Durable Tool Steel Construction - Made from fine quality tool steel, stress relieved against distortion for long-lasting stability Comprehensive 10-Pair Set - Includes 10 pairs of parallels with varying widths (1/2 to 1-5/8 ) for diverse workholding needs Organized & Protected - Supplied in a fitted durable plastic case, ensuring secure storage and easy transport of the entire set Versatile Machining & Inspection - Ideal for supporting workpieces accurately in milling, grinding, drilling, and inspection tasks ASIN B01ABWUGLE Item Weight 3.46 pounds Manufacturer HHIP Item model number 3900-3002 Product Dimensions 6 x 6 x 3 inches