Features: Protect the front and rear of the lens from dust, smudges and scratches. Comes with an anti-lost rope to prevent the lens cover from being lost. Easy to use, just pinch the center to quickly install to the front of the camera lens. Made of high-quality ABS plastic, light weight and good shape. Suitable for Pentax and other DSLR cameras 37mm/ 40.5mm/ 43mm/ 46mm/ 49mm/ 52mm/ 55mm/ 58mm/ 62mm/ 67mm/ 72mm/ 77mm/ 82mm lens, etc. Specifications: Material: ABS Caliber: 37mm/40.5mm/43mm/46mm/49mm/52mm/55mm/58mm/62mm/67mm/72mm/77mm/82mm(Optional) Diameter: Approx. 37mm/1.46" Diameter: Approx. 40.5mm/1.59" Diameter: Approx. 43mm/1.69" Diameter: Approx. 46mm/1.for 81" Diameter: Approx. 49mm/1.93" Diameter: Approx. 52mm/2.05" Diameter: Approx. 55mm/2.17" Diameter: Approx. 58mm/2.28" Diameter: Approx. 62mm/2.44" Diameter: Approx. 67mm/2.64" Diameter: Approx. 72mm/2.83" Diameter: Approx. 77mm/3.03" Diameter: Approx. 82mm/3.23" Package Includes: 1 Piece Snap-on Lens Cap note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you mind. Due to the difference between different monitors, the picture may not reflect the actual color of the item.