Material: The base of these adjustable helping hands for PCB Board is made of a Solid Metal with a scratch resistant Black Coating, to provide a heavy, steady base for absolute stability during precise soldering. 4 Soft rubber pads give the holder maximum grip to the surface. The sides are made of lightweight Plastic that smoothly glides over the heavy steel base when adjusting the width.The Spring-loaded PCB Holder Clamps have 4 different openings to tightly secure the Breadboard in. A strong spring allows you to open up the PCB Holder for any adjustments that need to be made. The Soldering Helping Hands can be turned 360 Degrees to give full acces to both sides of the Circuit Board. The PCB Holders are made of first grade fire resistant Ceramic to make it fireproof and super sturdy.Size: Total Length: 30cm; Max. Opening Width: 20cm; Height: 12.5cmMax. Circuitboard Size: 20 x 14cmItem model number UniversalColourBlue/BlackMaterialPlastic