The Borka Tools Double PTL (4 & 8 inch-lbs) Kit w/ Separate Screwdriver Bits Kit (SBK), model PTL004008K3, is a specialized preset torque limiter tool kit designed for low-torque rifle optic micro-fasteners. Operating fully mechanically without batteries or external power, the kit provides dedicated factory-preset limiters of 4 in-lbs and 8 in-lbs to prevent the stripping or over-tightening of delicate scope components, such as Nightforce zero-stops and Vortex turret set screws. Each limiter uses dual-direction clutching, providing ISO-6789 calibrated torque limiting in clockwise rotation and slip-protection during counterclockwise rotation to protect internal mechanisms when loosening stuck fasteners.

Key Features

• Factory-Preset Calibration: Features fixed internal calibration for 4 in-lbs and 8 in-lbs to eliminate user adjustment error in the field.
• Dual-Direction Clutch Mechanism: Limits torque in both clockwise (CW) and counterclockwise (CCW) rotation to safeguard internal assemblies.
• Standardized Tooling Fitment: Equipped with a 3/8-inch square female input and a 1/4-inch hex female output with magnetic bit retention.
• High-Capacity Manual Handle: Includes a compact 4.37-inch driver/ratchet handle rated up to 250 in-lbs of maximum torque load.
• Comprehensive Bit Selection: Supplied with an S2 tool steel screwdriver bits kit (SBK) and drive extensions inside an impact-resistant hard case with custom-cut protective foam.

Product Specifications

• Torque Limiters Included: 4 in-lbs and 8 in-lbs factory presets
• Limiter Dimensions: 0.87 in (22.1 mm) Outer Diameter × 3.0 in (76.2 mm) Length
• Limiter Weight: 3.5 oz (approx. 99 g) per unit
• Handle Dimensions & Rating: 4.37 in (111 mm) Length; rated up to 250 in-lbs
• Drive Interfaces: 3/8-inch square female input; 1/4-inch magnetic hex female output
• Bit Material: S2 tool steel
• Power Type: Fully manual mechanical operation

Who is the Borka Tools Double PTL (4 & 8 Inch-Lbs) Kit for?

• Precision long-range rifle shooters adjusting optics turrets — requires the exact 4 in-lbs or 8 in-lbs factory presets to adjust delicate elevation, windage, and zero-stop set screws in the field without carrying heavy workshop tools, aided by compact 3.5 oz limiters.
• Gunsmiths servicing micro-fasteners on high-end rifle scopes — requires non-adjustable 4 in-lbs and 8 in-lbs limiters to safely service micro-fasteners below standard hand-tight thresholds while utilizing a ratchet handle rated to withstand up to 250 in-lbs.

Less suitable for: Applications exceeding 8 in-lbs (such as scope ring caps requiring 15–20 in-lbs or action screws requiring 50–65 in-lbs), which require an adjustable driver or dedicated higher-rated torque limiters, and use with motorized or cordless power drivers, which causes rapid internal mechanical wear.