Not require precise hole deepth or hold cleaning out. Anchor can be hammered below the surface of the concrete when up longer needed. The one piece clip is formed around Anchor, assuring full expansion for dependable, superior holding power, Expanding clip will not fall off or twist in the hole. The test values listed were obtained using 246-281kgs concrete(no aggegate). A safe working load should not exceed 25% of stated value. Size: M6-M20 lenght: 40MM-300MM.