Where can I buy school basketball stands from a professional basketball stand manufacturer in Qingdao, Shandong?

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Where can I buy a school basketball stand from a professional basketball stand manufacturer in Qingdao, Shandong [Underground basketball stand installation explanation]
Installation instructions for underground basketball stands
() Digging requirements: length*width*depth; fill with concrete after the basketball stand is installed.
Where can I buy a school basketball stand from a professional basketball stand manufacturer in Qingdao, Shandong? () The edge of the basketball stand is from the end line of the basketball court.
() The backboard, basketball stand, and rim are fixed with four * screws. The fulcrum installation of the tempered glass backboard must ensure that the force on the backboard is even, so as to avoid the backboard from breaking due to uneven force.
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After the basketball stand columns are installed, wait for the concrete to reach its strongest state (approximately days) before installing the backboard.
Where can I find a professional basketball stand manufacturer in Qingdao, Shandong that sells school basketball stands? You can also bury the ball stand after installing the backboard and hoop.
Note: You must find suitable ropes or other items to fix the basketball stand uprights or suitable supports to fix the basketball stand uprights to avoid inappropriate installation angles due to unbalanced ball stand uprights.
Where can I buy a school basketball stand from a professional basketball stand manufacturer in Qingdao, Shandong? Note: Keep the balance of the backboard during installation to avoid breakage of the backboard due to imbalance.
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