Alloy steel pins carbon steel body. Shackles and pins are heat treated and tempered for maximum strength and ductility. Shackles meet most military specifications. Do not exceed working load limits.No. M645G: 3/8" Width B/T Eyes, 7/8" Inside Lgth.No. M646G: 15/32" Width B/T Eyes, 1-1/8" Inside Lgth.No. M647G: 17/32" Width B/T Eyes, 1-1/4" Inside Lgth.No. M648G: 21/32" Width B/T Eyes, 1-7/16" Inside Lgth.No. M649G: 3/4" Width B/T Eyes, 1-11/16" Inside Lgth.No. M650G: 13/16" Width B/T Eyes, 1-7/8" Inside Lgth.No. M651G: 1-1/16" Width B/T Eyes, 2-3/8" Inside Lgth.No. M652G: 1-1/4" Width B/T Eyes, 2-13/16" Inside Lgth.No. M653G: 1-7/16" Width B/T Eyes, 3-5/16" Inside Lgth.No. M65