This charging handle is designed to replace the stock charging handle on the SIG 55x series. It is slanted downwards to improve usability when running an optic on the SIG 55x rifles. 3rd picture shows how the charging handle looks like mounted on a SG553r rifle.
 
hardened steel
phosphated surface
improved texture for grip
recommended to be used on genuine Swiss SIG pistols/ SBRs/ rifles
does not fit SIG 552 (unless 553 conversion kit is installed)
does not fit US-made SIG 551A1 and 556 unless modified
made in Switzerland