Greaseable Tandem Axle Trailer Spring Suspension Rebuild Kit Wet Bolt EQ-356 e work on trailers in our Facility Every day! The number one problem we see is worn out suspension! And there is now way to grease them! Now, with this NEW kit, the bolts actually pump grease right into the bushings! AMAZING! This is a kit to change all the "wear parts" on a standard tandem axle trailer (4,000 # GVW up to 14,000# GVW) . This is for standard "Eye to Eye " Springs, not "slipper" springs (bolt on one end of spring only), For standard 1 3/4" wide springs. This Kit includes Grease able WET BOLTS. Tired of replacing the suspension bolts on your trailer? With these wet bolts, you could add THOUSANDS of miles on to your trailer