These clamps can easily be used with just one hand the cramps come in various sizes but also adjust thanks to the spring mechanism securely fix projects in place while the clamps protective tips prevent your work pieces from being damaged 4 span clamps span width 100 mm 2 spring clamps 220 mm span width 90 mm 4 spring clamps 160 mm span width 55 mm 4 spring clamps 110 mm span width 35 mm all cramps are made of a special sturdy plastic