Edma's frame clamps are designed for connecting metal joists/support pillars and rails. With the clamps you can connect joists to each other without screws or pop rivets!

Press the pliers at the connection point of the support structures, which will press a notch in the inner piece and bend the outer piece through it. The rubber grip surface improves comfort and the wide handles allow for squeezing with two hands.
Features:

For connecting joists and rails
No pop rivets or screws!
Rubber grips
A quick and easy way to connect support structures