Engh Unicondylar Minimally Invasive Knee Surgery Set. Includes the following: 101-4910: Rake Retractor with 38 x 25 millimeter rake head 101-492001: Cement Scraper Right with 5 x 9 millimeter rake head 101-492002: Cement Scraper Left with 5 x 9 millimeter rake head 101-493001: Offset Osteotome with 10 x 10 millimeter head 101-493002: Offset Osteotome Double Bend with 10 x 10 millimeter head /