Fowler High Precision This set includes everything you need for part set up! Set Includes: 1-2-3 Block Set: Tolerance: .0001" (squareness per inch). Dimensions: 1" x 2" x 3" Hardened to 58-60 Rockwell C Matched accuracy within .0002" per inch. Jack Stand Set: Up to 1000 lbs. Range: 2.25" to 3.375" Jack base diameter: 1.25" 1" and 2" extension bases. Extensions may be combined. Space Blocks: 3/4" diameter, 1/4"28 ID thread Ground hardened and tapped. 4 connection screws included. Accuracy: ±.0001" Angle Block Set: Precision ground. Accuracy: ±30 seconds. All blocks 3" long and .250" thick. Each set includes 1° thru 5° blocks in 1° increments and 5° thru 30° blocks in 5° increments as well as 1/4" and 1/2" blocks