these no tool fin screws are made of Stainless Steel , solid and stable, not easy to broken, deform or fade they are waterproof and will not rust whether in freshwater or in saltwater, and durable Portable and lightweight: the stainless steel fin screws are in size so that they are easy to and will not take up so much space as as they are easy to take around Simple to operate: this thumb fin screw is easy to install, you 't need other tools, suitable and friendly for beginners and those who like surfing, you can refer to the to install it on your surfboard Applicable occasions: stainless steel fin screw and plate are suitable for many types of surfboard, such as long board, single board, single fin board, paddle board and so on Colour:silver :Stainless steel Package Contents: 10 x Fins screw Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.