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By certification 
Drop-in anchors are internally threaded expansion anchors with a preassembled expander plug. This type of anchor is used for flush mount applications in solid base materials. The anchor is set by driving the expansion plug towards the bottom of the anchor using the setting tool.
Perfect expansion and specially designed built-in plug ensures full expansion of anchor.
These anchors are available zinc plated or stainless steel.
The test values listed beneath were obtained using 200-250 kgs/cm2 Concrete(no aggregated). A safe working load should not exceed 25% of stated values.
http://www.shuangyuanchor.com/
