Shut-Off Screwdriver. Proved by the life-time tester, these items can be operated continuously up to 1.5 million times. Industrial grade, excellent for long continous operation on various mass production lines. Precise machined components, unique internal mechanism design. Low noise and vibration rate, high adjustable accuracy up to + - 5%. Pressing to start level, ergonomic design, compact volume, light weight, easy and comfortable to operate. Shut-Off Screwdriver