On Off Magnetic Block for Burning Guides, Two Blocks, Fits up to 1 8 in Thick Standard Square or Straight Edge ORS NASCO Can be used with most Can be used with most major multi pole breakers that use a tie bar Constructed from glass filled nylon Easy to use Compatible with most major manufacturers Compressible Graf Tite® high pressure seats withstand high temperatures and extend tip life In tip mix resists flashbacks for maximum efficiency Full swaging minimizes gas turbulence Concave tip end reduces backfire and resists flameout when base metal is accidentally contacted during cutting For hand On Off magnetic support blocks can be attached to any standard square or straight edge to form your own burning guides Blocks are machined from aluminum and have grooves on three sides Included are set screws to easily adjust blocks on straight edges or squares Options available for one On Off magnetic block (MSB201) or two On Off magnetic blocks (MSB202)