This arm features a Size ONE Quick Change Chuck, and includes 5 FREE Size One Tap Holders, a 30 day free trial and a three year warranty. 
 
Complete mobile package upgrade includes: 
Tapping arm,  tap-stand, 5 free tap holders, and $100 in tooling to OSG. 
 
Technical Stats
Working Range: 14" - 51"
Size 1 Quick Change Chuck
Taps up to: 9/16"
Runs on 90 PSI