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Road Block/Tire Deflation Spike(with tubular spikes,easy to expanding and folding) 1) Tire delflation device with plastic pedestal and stainless spike(thorn) material 2) Tire deflation in 30 seconds 3) Length:5/6/7/8 meters 4) Box: PBD board with aluminum alloy bar 5)Multi-times use 6) Available for each kind of vehicle 7) Use as road block,tire deflation,spike,police supplies,riot contron product, antiriot product,and army item Packing: Standard export carton Our puncture roadblock has passed the detection of the special police product quality supervision center of Public Security Minister. The item of product testing: gernal requst, operational flexbility,the quality,the effective legth of roadblock, the effctive length of prod, the efffective distance of prod, the prods pull out strength,the effective intercept time, climate and environment adaptability, totally 9 items are all in accordance with the relative requests of <<GA421-2003 Pucncture deflated road block>> Product detection number : Public Police inspection of the 095005