A heavy 6"x 4"x 3" half of a hold-down bolt from one of the SRBs used to launch STS-135, the last Shuttle mission. Each SRB used 4 bolts, so there were 16 of these presentations made and given to management personnel, including Leinbach, the Launch Director on the mission. Presented on a 14"x 10" wooden base bearing a thin stainless plaque. Excellent condition. From the personal collection of Shuttle Launch Director Michael Leinbach.