Non-Reflective Manganese Phosphate Finish. For 1-1/4" Slings. Featuring extremely tight machining tolerances and pull testing to over 300-pounds of pressure, this heavy-duty swivel set utilizes a non-glare manganese phosphate finish to eliminate reflection. Specifications: Heavy Duty swivel is constructed with an extra beefy base & push-button 3/16" diameter loop to handle maximum weight and abuse Machined steel swivels with 1A 1/4" loops Manganese Phosphate finish Smooth-operating, centrally-located push-button and polished ball bearing surfaces for easy attachment on firearms equipped with quick-detach bases. Provides quiet, 360Adeg rotation of the swivel to eliminate sling tangle and improve all day carry comfort. 100% USA MADE.