Model KGot Questions?Call us at (407) 923-3724or we can call you!Model K Portable Bolt-Tension CalibratorFastener: Bolts 1-1/4” through 2-1/2” (M32— M64) Preload Capacity: 225,000 lbs (can be upgraded to 450,000lbs—2,000Kn) Tool/Size: 1” to 2-1/2” square drive Test Bolt Assembly: 6 sizes available — 1-1/4” to 2-1/2”