Fitment: universal for small,medium and most thick coil spring, not fit very thick wire(OD>5/8inch), as full sized truck or heavy duty owner, you'd better check this OD
Nice Safety Feature:little pins that keep the compressor from flying off the coil spring. Locks it onto the spring so it can't come off until you pull it back
Tightening End:as well as a half inch square drive(1/2" ratchet hole) you can use a 7/8 inch socket. no instruction included
Strong:constructed of nice quality materials(updated)-impact gun is not recommended due to safety but can be used if needed
Package: the included case is great for storage and keeping them clean, free from dust and cobwebs