The DEWALT DCS577DC Dust collection adapter is a attachment that allows you to connect your DCS577 DEWALT 7-1/4" Worm Drive Style saw to a dust collection system or vacuum. This attachment is compatible with DEWALT's dust collection system adapters DWV9150 and DWV9100. This adapter is designed to accept common 1-1/2" diameter hoses, which allows for system flexibility. Includes: Dust port attachment, Fastening screws, assembly instruction sheet.