Wera Tools (5052502001) 889/4/1 K Rapidaptor Universal Bit Holder for 1/4" Hex Drives, 2" Long Stringliner The UC3551A has a chain

The UC3551A has a chain speed of 2

095" trimmer line

Clamping Force: 1320 lbs

More metal in high stress areas to stiffen jaws

Six radial antifriction bearings

Wera Tools (5052502001) 889/4/1 K Rapidaptor Universal Bit Holder for 1/4" Hex Drives, 2" Long Stringliner The UC3551A has a chainWera 889 4 1 K Rapidaptor Universal Bit Holder is designed for rapid bit changes. Rapidaptor allows for quick one handed bit change for both insert and power bits. Bits are easily inserted with press in and self locking mechanism that holds bit securely and wobble free. Free spinning outer sleeve stabilizes tool during screwdriving process, easily applying tool to screw to prevent slipping. Fits all 1 4 DIN 3126 C 6. 3 and E 6. 3 bits. Rapidaptor