What is the difference between internal expansion and ordinary pull-blast (external expansion)?
The expansion sleeve of internal expansion bursts open inside the hole, with the force acting on the hole wall, and the head is flush and does not protrude; external expansion relies on a conical nut
Expands from the outside inward. For applications requiring a flat mounting surface such as door and window frames, internal expansion is more suitable.

Can it be used on hollow bricks?
Internal expansion anchoring relies on solid hole walls. It works well in concrete and solid bricks; in hollow bricks and aerated blocks, the anchoring force
will decrease significantly. It is recommended to first confirm the wall material, and if necessary, switch to another anchoring method (you can leave us a message).

What is the surface treatment? Will it rust?
Carbon steel with color zinc plating. It is fine for long-term use indoors and in general environments; for humid/outdoor rain-exposed environments, it is recommended
For an upgraded stainless steel version, you can inquire with us for pricing.

How is it installed?
Drill the hole → blow out the dust inside the hole → hammer the expansion bolt into the hole → tighten the screw, and the expansion sleeve expands to anchor.
Drill bit diameter and anchoring depth correspond according to specifications (an installation parameter table can be provided after ordering).

What is the minimum order quantity?
Wholesale starts per box, with a minimum order of 1 box (each box contains 600-2000 pieces, depending on specifications), and mixed batches of multiple specifications are supported.

Can it be labeled with our own brand?
Neutral packaging or private labeling is supported, but it must be confirmed in writing before placing an order.