Misc Diving Knife Single Edge. 8 1/2 overall. 4 1/8" blade with partial serration on top edge. One piece stainless construction. Black molded plastic sheath with rubber arm/leg straps. Made in China." 8 1/2" overall. 4 1/8" blade with partial serration on top edge. One piece stainless construction. Black molded plastic sheath with rubber arm/leg straps. Mfr Part Number: MD-1BS.