Ursmile Stainless Steel Neck is Octagonal. With the 45# steel quenching temperature, it¡¯s more durable. Its one side hole threaded to connect the internal part, another produced as inner octagonal bore, such as the two squares overlap angle of 45 degrees, it can make a 45-degree angle wrench handle to be displacement, the cone shape on longitudinal section of the inner hole is tapered, basically consistent with bevel shape of the chord shaft.
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