POWERTEC 70135 P4 4 Inch Aluminum Blast Gate for Dust Collector, Dust Collection Fittings, 4 PK bibny prep instructions 0192928050790 prep instructions The onboard LED cutline guide casts a shadow against the blade to illuminate your line of cut for maximum accuracy while the dust collection port allows for connection to either the included dust bag or your dust collection device of choice actual size – tapers from 3 29 32 to 3 31 32”) for most shop vacs shop dust collector systems with 4” ID hoses for woodworking – providing a reliable port extension for your table saws Premium Construction POWERTEC Blast Gate features a solid aluminum body with a highly durable stainless steel gate providing a more long term and durable solution to plastic versions