IVANKO Cast-Iron Dumbbell Set (Maximo 45) 4 - (R-5) + Iron plates with machined holes. 4 - (R-2 1/2) + Iron plates with machined holes. 4 - (R-1 1/4) + Iron plates with machined holes. 2 - (DBH-14) + Dumbbell handles, hot rolled, solid steel & 2 (S-5) sleeves. 4 - (CL-1/2) + 1/2 lb. dumbell collars & 4 - (SQ- 5/16) + Screws (for C-1/2 collars).