rb-01t roller ball - plunger contact rb01t push button switch gri gri's roller ball switch is a unique application of a magnetic reed combined into a single package, mechanical plunger action and the reliability of a hermetically sealed switch. the ball plunger can be activated from any direction within 360 degrees, using a sliding motion such as that produced by the opening or closing of a door or window into its frame. but they also have been used very effectively as an interior trap device by mounting on a flat surface, such as a display table, and placing the protected object directly on the switch to conceal and actuate the roller ball. gri roller ball switches can work when nothing else will. spacers and mounting hardware included with switch and also available separately. the terminal version is indicated by the addition of "t" after the part number. ds-01 w white gri on amazon ds01w closed when the ball is depressed similar to ds-01t as a replacement. lifetime warranty - colors: white and brown - ul and ulc approved - available in closed loop, open loop and spdt - works from all 360 degree directions - standard 12" leads or terminal blocks - longer leads, zip cord or jacketed cable available - supervisory loops available - includes mounting hardware and spacers - terminals require no soldering, b connectors, or taping - pre-travel .06" - total travel .195" gri's roller ball switch is a unique application of a magnetic reed combined into a single package, mechanical plunger action and the reliability of a hermetically sealed switch. the ball plunger can be activated from any direction within 360 degrees, using a sliding motion such as that produced by the opening or closing of a door or window into its frame. but they also have been used very effectively as an interior trap device by mounting on a flat surface, such as a display table, and placing the protected object directly on the switch to conceal and actuate the roller ball. gri roller ball switches can work when nothing else will. spacers and mounting hardware included with switch and also available separately. the terminal version is indicated by the addition of "t" after the part number.