HDDOR ST 2.5 P3-5 Ramp Set represents a pair of head replacement tools which can be used to safely and easily replace heads on the Seagate 2.5" ramp hard drives with 3 and 5 platters which “park their read/write heads” on a ramp. The set contains: P3 tool This head replacement tool can be used on 2.5” Seagate ramp hard drive models which have 3 platters and with their heads parked on a ramp. P5 tool This head replacement tool can be used on 2.5” Seagate ramp hard drive models which have 5 platters and with their heads parked on a ramp.