K2-B Heavy Duty Stub-End Thimble Reinforced Description Heavy Duty Wire Rope Thimble K2-B conform to type K2-B,aka type K2-B reinforced thimble with gussett,made of superior mild steel. Heavy Duty Stub-End Wire Rope Thimble K2-B offer superior resistance to corrosive elements over standard zinc-plated components so they’ll ideal for outdoor applications such as guy wire, tensioning, and other critical, heavy duty jobs.