These extension clamps feature heavy-duty electroplated zinc alloy construction and dual prong adjustments. Clamps have a maximum temperature use of 80°C. CLHD01 - 4" long extension rod is constructed of stainless steel. Prongs open to about 1.75", have a recommended maximum grip size of about 1.5", and feature double keyed spring-type adjustment screws. Prongs are covered with non-slip silicone sleeves and includes fiberglass sleeves. Overall length is 6.75". CLHD02 - The 5" long extension rod is constructed of stainless steel. Prongs open to about 2.75", have a recommended maximum grip size of about 2.5", and feature double keyed spring-type adjustment screws. Prongs are covered with non-slip silicone sleeves and includes fiberglass sleeves. Overall length is 9". CLHD03 - The 5" long extension rod is constructed of stainless steel. Prongs open to about 4", have a recommended maximum grip size of about 3.25", and feature double keyed spring-type adjustment screws. Prongs are covered with non-slip silicone sleeves. Overall length is 10.75".