The VersaBracket-47 comes with a 1" slot on top as the standard part. A structural aluminum attachment bracket, VersaBracket is compatible with almost any trapezoidal exposed‑fastened profile. No messy sealants to apply! No chance for leaks! The VersaBracket comes with factory‑applied butyl sealant already in the base, and the S-5!® patented reservoir conceals the sealant from UV exposure, preventing drying and cracks. ROOF FASTENER SCREWS SOLD SEPERATELY.