Lockingly

The hoop members include locking means within the U-shaped channel which, when the upper and lower edges of the side wall member are inserted within the U-shaped channel, lockingly affix the hoop members to the side wall member.

The principle of a clip lockingly engaging under the metal to which it is affixed had been in general use in the automobile industry.

Fee smiled and held his hand, she looked into his eyes and he held her gaze lockingly.