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 Controlled screw tightening in the most widely used range of 1 - 850 N·m / 10 lbf·in - 630 lbf·ft 
 For use in almost all industrial manufacturing areas Features: 
 Classified to DIN EN ISO 6789:2003 Type II Class A, with a factory certificate. Working accuracy: +/- 3% tolerance of scale set torque. The specification of the standard (+/- 4%) is exceeded. 
 Adjustable torque wrench with square drive and integrated ratchet function 
 For controlled bi-directional tightening (type K, US), type UK (5550) only for controlled clockwise tightening 
 1/4", 3/8", 1/2" interchangeable mushroom head with ball locking device as per DIN 3120 - A 6.3, A 10 or A 12.5, similar to ISO 1174 
 With 3/4" push-through square drive with pin-locking mechanism (from model no. 4550-40) 
 With certificate acc. to DIN EN ISO 6789, traceable via in-house DKD laboratory to national standards 
 Release system triggers a tactile and audible signal 
 Sturdy, satin chrome-plated tubular steel design, with chrome-plated ratchet head and high-quality plastic parts 
 Dual scale N·m and lbf·in / lbf·ft below a window with a magnifying glass effect 
 Magnifying glass with marking for minimum paralaxe errors allows a high degree of safety when setting the requisite torque value 
 Additional micrometre scale for setting interim values 
 Ergonomically shaped, convenient black plastic handgrip 
 With an indentation in the middle of the handgrip as a calibration aid 
 TORCOFIX K US (6550 - 6551) - version for Angloamerican units