The most precise and technically advanced torque driver for guns. Specifically developed for optics mounting and gun buildsFeatures : COMPLETE BIT SET: 83 professional gunsmithing, hollow ground / square cut bits. ACCURATE TORQUE DRIVER: precise 1 in-lb torque increments for superior accuracy and confidence. NO SHADOW, LED DRIVER: illuminated, long, bit driver extends to hard-to-reach and hard-to-see areas. WELL-ORGANIZED: easy-access case features bits labels and two magnetic compartments.