This listing is for a set of (8) Speed Pro Hypereutectic Flat top w/ 4 valve reliefs Pistons & matching Moly Rings compatible replacements for 1968-85 350 Chevy. 350 BASED engine (4.000" bore x 3.480 Stroke). In your choice of Over sizes. Click on box for over size needed before placing in cart. Ring dimensions 5/64, 5/64, 3/16 Accommodates pressed or floating wrist pin installation. LOCK RINGS for floating pins ARE SOLD SEPARATELY and are not included with this set. Part# LR63 SPEED PRO X 16. Sets are available with lock rings at ASIN B09MZKRJ1J. Copy this ASIN number and place in the Amazon search bar.