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Product description 420C solid stainless steel ball catapult ammunition high-precision bearing, smooth, corrosion resistant, wear-resistant3/4~40 mm; Product description 420C solid stainless steel ball catapult ammunition high-precision bearing, smooth, corrosion resistant, wear-resistant3/4~40 mm; 420C solid stainless steel ball catapult ammunition high-precision bearing, smooth, corrosion resistant, wear-resistant3/4~40 mm