Specification: Extra wide 3/4″ opening for better spread and less risk of plugging Compatible Equipment:C shank opener Features & Benefits: Can be used with the VW7CC and VW21DSF to double shoot or with the VW10FC, VW11FC, VW12FC, or VW13FC to single shoot. VW 14FB can also be used with the VW7CC & the new VW21SB ( side band ) L & R