Heli-Coil 535-12 Thread Insert Prewinder Body / Adapter Sleeve. Product Specifications: • Brand: Heli-Coil • Part Number: 535-12 • Thread Size / Application: 3/4"-16 UNF • Patent Number: 3,348,293 • Overall Length: Approx. 3-1/4 inches • Material: Knurled aluminum sleeve body with internal steel guide threads.
