The SkyClimber® family of hoists includes the Alpha Hoist Series that has often been referred to as the Mercedes or Cadillac of Hoists, the Compact Hoist Series that was designed to be much lighter in weight yet have the same durability as the Alpha, and the the Sky Lock. The Sky Lock is an overspeed safety device. It acts as a brake in emergency situations. Each of these hoists consists of a half dozen or so different models. The differences in these models range on horsepower, overall capacity, speed, weight and dimension size.