Sr long horn has a 4.125inch long x. 125 thick o-1 high carbon tool steel blade. The frame is constructed from aircraft grade billet aluminum(t6160), with hardwood inlays and a pocket clip. The lock is made from o-1 as well, dressed up with knurled brass thumb studs. The pivot is a high carbon steel with brass bushings. Open length is 9.75inches long, closed length is 5.5inches long. Thickest point of the knife is. 75inches please note this is a large knife.