effective diameter of bolt or high-strength bolt

Fastening Bolt， Binding Bolt

reamer bolt [= rimer bolt]

taper bolt [= tapered bolt]

abdomen retractor

abdominal retractor

abdominal self-retaining retractor

amputating retractor

anal retractor

aortic valve retractor

appendectomy retractor

atrial retractor

automatic thyroid retractor

automatic wound retractor

baby retractor

bladder and suprapubic retractor

bladder retractor

blade retractor

block tin retractor