Pinit RFI Mast Extension Kit; Clamp Set SKU: MEK Mast Extension Clamp Kit Login for pricing DESCRIPTION SPECIFICATIONS PDFS, DOWNLOADS & VIDEOS The MEK mast extension kit comes with 2 U-bolts and saddle clamps to assist with securing two masts together.Passivated Steel U-boltHot dip galvanized V platesZinc plated mild steel nuts and washers