Hoppe's 9 Maintenance Kit for Pistol/Rifle .17 Caliber. Hoppes Air Pistol/Rifle Maintenance Kit contains three-piece steel rod with looped handle lubricating oil brass knob end .17 caliber brush cleaning patches and Hoppe's "Guide to Gun Care." Package Contents: Hoppes Air Pistol / Rifle Maintenance Kit AC1 Specifications for Hoppe's 9 Maintenance Kit for Pistol/Rifle: Manufacturer: Hoppe's 9 Projectile Caliber: .17 Caliber Pieces: 6 Gun Type: Rifle Pistol Package Contents: Hoppe's 9 Maintenance Kit Air Pistol / Rifle .17 AC1 Hoppe's 9 Maintenance Kit - Air Pistol / Rifle .17 AC1