Perfect for joining vertical interior panels of heavy glass in malls, these Mall Front Clamps offer convenience and safety. They are designed to be used with 1/4'' to 1/2'' (6.4 to 13mm) tempered glass and are compatible with monolithic tempered glass. These clamps are easy to install and help prevent finger or clothing entrapment between the glass panels. To tighten the square cap, simply insert a 3/32'' drill into the round holes in the beveled edge and turn. The 1-1/2'' x 1-1/2'' (38mm) square clamps are available in either solid brass construction with brushed nickel, brass, or chrome finishes, or aluminum construction with satin anodized or black finishes. It is recommended to maintain a minimum gap of 1/4'' (6mm) between the panels. For custom finishes, please contact the MBS Technical Sales Department. Please note that shipping weights provided are approximate and have not been verified. If you require the exact weight for shipping cost calculation, kindly request this information from MBS Customer Service before submitting your order. The product images shown are either of the actual product or a close representation. Please be aware that colors may vary due to differences in computer video cards and monitor color settings. Assembled with 4 x Clear Silicone Washer 2 x 304 Black Stainless Steel Hex Drive Flat Head Screws M4 x 18mm 2 x 304 Black Stainless Steel Hex Drive Flat Head Screws M4 x 20mm in separate clear bag 2 x 304 Black Stainless Steel Hex Drive Flat Head Screws M4 x 30mm in separate clear bag 1 x 2.5 Zinc Allen Wrench