The Roller Frame Locking Strip is used to secure the fabric to the roller frame.  Simply drape the fabric over the roller, insert the alignment clip to hold the fabric in place  and slip the locking strip into the T-slot.  Once inserted remove the clips and now you are ready to begin stretching to your desired tension.  Available in heavy duty universal rolls ( 80-AHLS-50 ) for most mesh counts and 100 foot black strip for coarse mesh counts  ( 80-AHLSB-100 ).