Screw Extractor,1/8 3R997. PROTO J9521. Screw Extractor, Extractor Type Straight Flute Extractor, Drill Size 1/8 in, Overall Length 2 5/16 in, Drive Size 1/2 in, Drive Type Tap Wrench. administered by BIS, and the International Traffic in Arms Regulations administered by DDTC.