FIRSTINFO Precision Certified Torque Limiting Limited Screwdriver Set, 1/4 Inch Universal Hex Quick Release Bit Holder, 2-12 in-lbs with Screwdriver Bits & Bits Extension Bar

💎Torque Ranges From 2 to 12 in-lbs / Accuracy Calibration -- 0.1 in. lb. increments. Torque limiting screwdrivers feature aluminum scale and tube to reduce weight and enhance durability. Also with screwdriver bits and extension magnetic bit holder bar for conveniently use.

💎Calibration Certificate Included -- ±6% accuracy, certified in accordance with ASME B107.300-2010 and ISO 6789.

💎Easily to Operate with Quick Release Design -- Just press the locking knob when adjusting the torque; release the locking knob when reaching the setting torque value. Equipped with quick release bit holder for easily attaching and releasing the bit.

💎Automatically Slips Design to Prevent Over-Tightening -- Three features when tightening fasteners: smooth, accurate, and consistent effects. When the torque reaches the desired torque value, the cam mechanism automatically slips to prevent over-tightening.

💎Stronger and Durable Construction -- Spring-loaded locking collar locks the scale when the torque is setting. Made of best materials which can reach the exacting tolerance.

👍️  Provide one-year warranty  that covers any manufacturing defects .

👍️ If there has any questions, don't hesitate to let me know . 

Features:

1. Tolerance of torque ±6%.
2. 6.35mm (1/4") Hex drive for bit.
3. Scale: 2-12in-lb
4. Torque limiting screwdrivers feature aluminum scale and tube to reduce weight and enhance durability. 
5. This torque screwdriver has three features when tightening fasteners: smooth, accurate, and consistent effects. When the torque achieves its maximum, the mechanism will automatically slip to prevent over-tightening. 
6. All models have an easy-release bit holder which securely retains bits or sockets during the operation. 
7. Clearly laser scale; each torque screwdriver with laser serial no. which can be traced easily. 
8. Spring-loaded locking collar locks the scale when the torque is setting. 
9. All torque screwdrivers are made of the best materials which can reach the exacting tolerance. 

MATERIALS 
* Bit holder：S45C 
* Hexagon Knob: Anodic treatment 
* Graduated ring & tube：aluminum 
* Grip: TPR 

MATERIALS 
* Bit holder：electroplating 
* Hexagon Knob: Anodic treatment (yellow) 
* Graduated ring & tube：Anodic treatment (black) 

HEATREATMENT 
* Bit holder：HRB 90~94 
* Hexagon Knob: HRB 25~30