small spring/retractable spring Product Instructions: Grade201,202,301,302,303,304,304l,304hq,305,316,316l,410,416,420,430etcStandard AISI,ASTM, , DIN, JIS, SUS Diameter50*50mmLength as per customer's request. Condition Soft wire,semi-soft wire, hard wire Surface finish Brushed / Mirror PolishPacking pp bag and carton for stainless steel..