Thumb screw
01
برغي الإبهام, برغي الفراشة
a type of fastener designed with a large, knurled or textured head that can be easily tightened or loosened by hand without the need for additional tools
أمثلة
He tightened the thumb screw on the shelf to secure it in place.
قام بشد برغي الإبهام على الرف لتثبيته في مكانه.



























