The RailBoss™ Gas Rail Drill from Trak-Star is the world’s most powerful and reliable 4-stroke Gas Powered Rail Drill. The drill incorporates a two speed gear box for using either the Black or Carbide Twister Bits. The 150 RPM range is for the Black Twister Bits or the 350 RPM range is for the Carbide Twister Bits. By using the RB2SPD and the Carbide Twister Bits, you can achieve up to 2-1/2 times the tool life in both standard and extremely hard rail. The drill features a smaller overall footprint, quill feed arbor with thru-the-tool coolant, a one stroke ergonomic feed handle and a 10 point clamping system. A center balanced carrying handle and weighing in at only 49 lbs makes transporting the RailBoss a breeze. Made in the USA.