Pack of 4 Driven Piece (Clutch Core) For 105-135 Gear Box of 4 Stroke (178F, 186F, 188F & 177F) Power Tiller consists of four clutch core assemblies, each designed for efficient engagement and disengagement within the transmission of 105-135 gearboxes compatible with 4-stroke tillers (178F, 186F, 188F, and 177F engines).