Eemann Tech Ultra Light Competition Hammer for Colt 1911, STI 2011 and clones. Material: Alloy Steel Caliber: All Catalog number: 40 Hammer weight: 11g All the EEMANN TECH parts for Colt 1911, STI 2011 and their clones are made from high quality carbon, alloyed or stainless steel using technologies and CNC machines of new generation.