123 blocks have an almost endless array of uses in the shop and can be used for machine set up, layout and inspection. 

Specifications: 

No Hole:

• Made of hardened tool steel (RC 56-60)
• Precision ground on all six sides
• Overall size within +/- 0.0001" (one ten thousandth of an inch) 
• Flatness and parallelism within +/- 0.0001" (one ten thousandth of an inch) 
• Squareness on all sides to within +/- 0.0003" per inch (three ten thousandths of an inch) 
• Pairs are matched to a tolerance of 0.0002" (two ten thousandths of an inch) 
• Two (2) pieces per set  
• Approximate weight per block: 786 grams.1.72 pounds

One Hole:

• Made of hardened tool steel (RC 56-60)
• Precision ground on all six sides
• Overall size within +/- 0.0001" (one ten thousandth of an inch) 
• Flatness and parallelism within +/- 0.0001" (one ten thousandth of an inch) 
• Squareness on all sides to within +/- 0.0003" per inch (three ten thousandths of an inch) 
• Pairs are matched to a tolerance of 0.0002" (two ten thousandths of an inch) 
• Two (2) pieces per set  
• One 1/2" untapped hole centered on 2" x 3" side 
• Approximate weight per block: 746 grams.1.64 pounds

11 Hole Universal: 

• Made of hardened tool steel (RC 56-60)
• Precision ground on all six sides
• Overall size within +/- 0.0001" (one ten thousandth of an inch) 
• Flatness and parallelism within +/- 0.0001" (one ten thousandth of an inch) 
• Squareness on all sides to within +/- 0.0003" per inch (three ten thousandths of an inch) 
• Pairs are matched to a tolerance of 0.0002" (two ten thousandths of an inch) 
• Two (2) pieces per set  
• Hole arrangement: 5 each 5/16"-18 tapped holes (3 on the 2” x 3” face, one on the 1” x 2” face and one on the 2” x 3” face) arranged for fastening blocks to a surface or to each other for conversion to angle plates and various fixtures. Also included are 6 each 3/8” holes with 1/2” deep counterbores to allow bolts to pass through block faces to threaded holes keeping bolt heads imbedded within the block with no exposed hardware. Multiple attachment configuration are possible using 2 each 5/16-18 machine screws.  Buy screws
• Approximate weight per block: 492 grams/1.07 pounds
  

23 Hole: 

• Made of hardened tool steel (RC 56-60)
• Precision ground on all six sides Overall size within +/- 0.0001" (one ten thousandth of an inch) Flatness and parallelism within +/- 0.0001" (one ten thousandth of an inch) Squareness on all sides to within +/- 0.0003" per inch (three ten thousandths of an inch) Pairs are matched to a tolerance of 0.0002" (two ten thousandths of an inch) 
• Two (2) pieces per set  
• 23 each .340" through holes (5 holes tapped with 3/8" x 16 TPI threads and 18 holes are untapped). Note: these blocks cannot be bolted together without exposed hardware. In order to attach multiple blocks together with no exposed hardware you will require the  Taytools 123 Block Hardware Attachment Kit available
• Approximate weight per block: 430 grams/.95 pounds 

WARNING: Cancer and Reproductive Harm -