On Off Magnetic Block for Burning Guides, Two Blocks, Fits up to 1 8 in Thick Standard Square or Straight Edge no checkout oil and weather Designed for standard oil and weather Designed for standard heat resistance LED lights that can be adjusted to needed angle for inspection in tight dark areas Heavy Duty grip will not slip in wet or oily hands 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) up to 1 8 inch thick