Saeyang Marathon N7 + SH37L (M45) 40K RPM + Pedal

The Saeyang Marathon N7 + SH37L (M45) is a professional e-file set designed for nail technicians who need a stronger stationary unit for manicure, gel removal, and full pedicure work. 

Key Features

• Up to 40,000 RPM
• SH37L (M45) handpiece included
• FS60 variable speed pedal
• Forward / reverse control
• Overload protection
• Built-in handpiece holder / cradle
• Standard 3/32" / 2.35 mm bit compatibility.

Why It Works Well for Professional Use

This model is best suited for nail techs who want more power and torque than compact 30K units. The Marathon N7 is a machine that easily handles complete pedicure treatments, while also being suitable for manicure and correction work. 

SH37L (M45) Handpiece

The SH37L (M45) is the main performance upgrade in this set. A 40,000 RPM handpiece with 4.5 N·cm torque, while one official-dealer style page lists the same N7/SH37L configuration at 5.0 N·cm and 240 g handpiece weight. . 

Technical Specifications

• Product type: Professional electric nail drill set
• Model: Marathon N7 + SH37L (M45)
• Max speed: 40,000 RPM
• Torque: 4.5–5.0 N·cm
• Bit size: 3/32" / 2.35 mm
• Control unit weight: about 1,700 g / 3.75 lb
• Control unit size: about 115 × 147 × 96 mm or 4.53" × 5.79" × 3.78"
• Handpiece weight: about 210–240 g. 

Best For

This model is a strong choice for nail technicians who want a stationary 40K salon e-file with more pedicure capability than lightweight portable systems, especially when variable pedal control and stronger torque matter.