Kason 1094 SureClose Hydraulic Door Closer with Flush Hook, Concealed Mounting, 11094000013 & 11094000026 Powerful gas-loaded hydraulic cylinder guarantees controlled closure Concealed mounting model with adjustable wide hook in flush to 3/4 inch offset; Model Numbers 1094000013 and 1094000026 Solid steel enclosed housing and bend-resistant hook assure long wear in heavy use Extra-wide hook ensures roller pick-up and overcomes alignment problems; mounting slots on hook allow for easy adjustment to compensate for door sag, keeping roller aligned with hook for proper function Life-cycle tested to operate reliably even after a half-million closures