半圆头方颈螺栓
half round head square neck bolt
step bolt
半圆头木工锉
half round head file for carpentry
大扁圆头半空心铆钉
large oval head socket shank rivet
加强半圆头方颈螺栓
strong oval head square neck bolt
金属半圆头螺钉
metal screw with half-round head
椭圆头半空心铆钉
oval head socket shank rivet
小半圆头铆钉
Round head rivets with small head--Black
半圆沉头螺栓
half round countersunk head bolt
500t半圆体
500 t semi-circular cylinder