The DIAMOND “B” Ground Wire Clamp is used in telephone and CATV drop installations to secure wire for grounding. Specifications · Made of high quality steel. · Mechanically galvanized to meet ASTM specifications A153 and B695. · Clamp dimensions are 9/16" long by 3/8" wide. · Clamp has a 1/8" curve to accommodate the wire to be grounded. · Hole diameter is 7/32". · R.E.A. accepted. · Manufactured in the USA.