Ultra fine machining grants smooth operation of unit. Unique plating process with final plating of 24k Gold. Patented WBT™ barrel provides both adjustment and locking function. The barrel is finished in polished ruthenium. A slotted center pin allows a perfect fit. Teflon™ insulation. Strain relief captured with Torx™ T6 size set screw. Maximum cable diameter allowed is 9mm² / 0.354 inches².