Mounting Bracket Side Knob Size Shawn January 29, 2020 17:19 Updated The mounting bracket side knobs that fit the SR-955HPC and SR-655HPC are: SR-655HPC----------5mm SR-955HPC----------5mm Related articles Mounting Bracket Side Knobs My 655hpc has a D.C. Low on the screen. What does this mean? Where to buy Frequency counter for the Stryker SR-497HPC / SR-447HPC (old version)? SR-447HPC / SR-497HPC Setup Guide What are the dimensions of the 655 & 955? Comments 0 comments Please sign in to leave a comment.