MPC LAD-B4-BK Heavy Duty  Linear Actuator 12 V DC, 4" Stroke, 225 lb., Black Finish Heavy duty linear actuator with 4 inch travel 225 lb max static load; 112 lb max dynamic load Overall Length: 9" (Min) to 13"(Max); Length Between Mounting Holes: 8.25" (Min) to 12.25"(Max) Perfect for operating tonneau covers, motorized trunks & hoods, amp racks and whatever else you may imagine! We have actuator wiring/switch kits.