Special version of Alps Channellock seat in size 16 with anti slip profile and "window" on both sides. Made of marine grade aluminum anodized matte black colour and 100% seawater resistant. Low weight, very slim, rugged and meticulously finished. When there is little space between blank and seat suitable for "blank exposed" mounting, or use the matching inserts. Suitable for middle class/some big pit reels with relatively slim feet, Shimano big pit with slim feet fits perfect.