Detonator risers feature a trick mounted domed top cover to keep the screws out of sight. They have internal fitted 1/2-20x2 1/2" UNF allen head screws that bolt straight into the rigid fork part of many aftermarket Springer forks. Note that stock pre-1988 Springer forks are not threaded there and some aftermarket forks have 1/2-13 UNC thread. Risers are sold in sets of 2, have a show chrome finish. Does not fit 1988 and later Springer forks as these have 5/8-UNF thread.