The MIW is a two-finger, slider guide cylinder with sequentially operating fingers making it an effective addition to conveyors, vibratory feeders, magazines and hoppers for separating and feeding individual parts or work pieces on assembly and production lines. An interlocking cam mechanism controls the air passage to the two piston rods, pressuring one while exhausting the other, producing the sequential operation. A floating mechanism separates the fingers from the internal piston allowing for easier finger replacement.