Quick view 1/2-28 RH Knurled Thread Protector (Pistol Version) Protect your 1/2"-28 RH pistol (or pistol adapter) threads with this knurled thread protector. Made out of oxidized steel, this protector is a great solution for those who want to save their threads for years to come. Thread Pitch: 1/2"-28 RH ... $10.00 Add to Cart Compare