SELF-Close Add On Set For Use With SA.SDR-A81-PRT Hardware Set (25-9/16" Minimum Door Width), Use One Set For One-Way Soft Close, Use Two Sets For Two-Way Soft Close Self Close Unit, Optional For Use With One Way Soft Close SA.SDR-A81-PRT Hardware Set. Guaranteed up to 10,000 cycles SELF-Close Add On Set For Use With SA.SDR-A81-PRT Hardware Set (25-9/16" Minimum Door Width), Use One Set For One-Way Soft Close, Use Two Sets For Two-Way Soft Close Self Close Unit, Optional For Use With One Way Soft Close SA.SDR-A81-PRT Hardware Set. Guaranteed up to 10,000 cycles