SINGLE
Can be used for fastening into rock, concrete, brick, etc.
If bolt is removed and replaced, holding power is unaffected.
One-piece design, made of zinc alloy, is entirely rust-proof.

DOUBLE
Can be used for fastening into rock, concrete, brick, etc.
Eliminates high stress points detrimental in fastening into materials of medium hardness, expands fully and has high gripping power.
Ideal for sheer loads or where bolt is subject to side pressure or vibration.
Does not fracture, and permits fastenings at any length.
The test values listed were obtained using 200-252kgs/cm2 concrete (no aggregate).
A safe working load should not exceed 25% of stated value.