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A bosshead, sometimes called clamp holder, is a metallic piece of labware used to hold various metal rods and extension clamps, like iron rings or other utility clamps.
Bossheads consist of an S-shaped thick metallic item, with two screws. Other models consist of a rectangular piece with two holes and metallic screws. Generally, made of plain steel, stainless steel, brass, aluminium or zinc (zamak). Special types of bossheads have a bent shape, while others have a thermometer clamp.
Bossheads can be purchased from lab suppliers. They can also be purchased online.